Adjusting device for hoisting-cables



(No Model.)

N. E. GREEN.- AEJUSTING DEVICE EOE EOISTING CABLES. No. 422,933. Patented Mar. l1, 18910.v

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NELSON E. GREEN, OE MINNEAPOLIS, MINNESOTA.

ADJUSTING DEVICE FOR HOISTING-CABLES.

SPECIFICATION forming part of Letters Patent No. 422,933, dated March 11, 1890.

Application filed February 27, 1888. Sozial No. 265,458. (No model.)

To all whom it may concern..-

Be it known that I, NELSON E. GREEN, a citizen of the United States, and a resident of the city of Minneapolis, county of Henne pin, State of Minnesota, have invented a certain new and useful Length-Adjusting Device for IIoisting-Cables, of which the following is a specification, reference being had to ventions set forth in that application a pair y of hoisting-drums are mounted on a common shaft, and one hoisting-bucket is rising toits emptying position when the other is descending to its filling position. The two cables are kept of such relative length that when one bucket has been drawn to its limit in its emptying position the other bucket will be in its filling position at the working-level- In excavating trenches for sewers and similar work, for which the machine was especially designed, the level from which the dirt is to be taken varies as the work progresses. made in the length of the cables for every material change in the working-level.

The object of my invention is to provide a simple device for speedily effecting this adjustment; and the invention consists in the construction hereinafter fully described, and particularly pointed out in the claims.

In the drawings, like letters referring to like parts, Figure I is a side elevation, Fig. II a longitudinal vertical section, and Eig. III a plan, of my invention.

A is a suitable hoisting-shaft driven in any suitable way from some suitable source of power. As shown, this shaft is in the form of a sleeve and is mounted on a fixed spindle B. This spindle is held in suitable supports C (one only being shown) on the main frame, a part of which is shown at G.

D is a gear-wheel keyed to the shaft A and engaging with the pinion E on the shaft E. The shaft F is coupled directly or indirectly A corresponding change must be to the source of power. (Not shown.) The shaft A is held from longitudinal displace ment on the spindle B by the support C at one end and a collar II at the other, which is mounted upon the spindle and removably secured thereto by a set-screw 7i.

To the shaftA is keyed a winding-drum K, and loosely mounted on the same shaft is a windingdrnm K. Keyed t0 the shaft A, and

bearing against the outer face of the hub of Attached to the under side of the angle` ?5" iron N, and bearing against the top of the locking-bar P, is a resistanceaspring Q, adapt# ed to keep the bar in its locking position. It is evident that by withdrawing the locking-bar P from the notched collar L the drum K may be unlocked from the shaft A.

On the drum K K are wound` hoisti'ngcaa bles R R of sufficient length to reach to the lowermost level from which any load is to be lifted. This having been done, the adjust ment of their relative length for any given level is readily effected. All that is necessary is to turn the shaft A. until the cable R is wound up to any desired limit on the drum K-say until the link r reaches the point marked X. Then unlock the drum K from the shaft A and turn it on said shaft, unwinding the cable R until it reaches the desired point-say until the link r reaches the point marked X. Then relock the drum K to the collar L. Thereafter whenever the link fr of the cable R is at X the link r of the cable R will be at X. It is evident that by making the proper adjustments from time to time the end of the cable R maybe made to reach to any desired level. when the cable R is wound up to its limit. These adjustments are very quickly made.

In the machine hereinbefre referred to, in order to adapt it to any given level, all that IOC through suitable gearing to the source of Ifo power in such a Way that it can be reversed. The drums K K are of sheave-like form adapted to receive the cables between their respective flanges-one layer of the cable directly on top of the other. 'As shown, the drum K is provided With a pair of lianges tt', cast integral With its-hub, While the drum K has but a single flange t, the flange t serving also to co-operate with t for holding` the cable R in its proper position.

It Will be understood, of course, that this omission of the inner flange from the drum K is a mere matter of economy and convenience When the two-drums are arranged side by side, as shown. They might equally Well be placed on a common shaft at some distance apart, and in that case each drum Would have to be provided with a pair of flanges.

It will be further understood that the locking device for detachably connecting' the looselymounted hoistingdrum K to the shaft A need not necessarily be of the exact construction shown. It may be varied Without departing from the principle of the invention. For example, the notches or projecting lugs might be on the face of the drum adjacent to the shaft, and the sliding lock might be mounted on the retaining-collar.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

l. The combination, With a reversible shaft, of a pair of hoisting-drums, one splined to said shaft and the other ,loosely mounted thereon, a locking device for detachably se- Vfixed to said shaft and provided with the notches Z, the keeper M, fixed to said drum K', and the spring-pressedsliding lock P, held in said keeper and adapted to detachably connect said collar and loosely-mounted drum, substantially as described.

3. The combination, with a reversible shaft, of a pair of hoisting-drums, one rigidly s`ecured to the shaft and the other loosely mounted thereon, a collar rigidly secured to said shaft adjacent to the loosely-mounted drum provided with notches on its periphery, a spring-actuated ylocking device adapted to detachably connect said collar and looselymounted drum, and independent hoistingcables mounted on said drums and Wound in opposite directions about the same, substantially as described.

NELSON EA GREEN. In presence of JAs. F. WrLnrAMsoN, EMMA F. ELLMoRE. 

